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There is a product ,witch contains a buffing compound and buffer to buff the lens with,sometimes it works,sometimes it does not,it depends on how deep the lens is contaminated,you can get it at the auto parts store

The door latch located in the door panel has a micro switch built into it assembly. It is what detects an open door. A new latch is about $150. If you could find a shop to replace it for you. You could also try buying some plastic-safe contact cleaner/lubricant and spraying the latch assembly out and opening/closing the door a few times to work it in.